const http = require('http');

const longComputation = () => {

  let sum = 0;

  for (let i = 0; i < 1e10; i++) {

    sum += i;

  };
 
  return sum;

};

const server = http.createServer();

server.on('request', (req, res) => {

  if (req.url === '/compute') {

    console.info('计算开始',new Date());

    const sum = longComputation();

    console.info('计算结束',new Date());

    return res.end(`Sum is ${sum}`);

  } else {

    res.end('Ok')

  }

});



server.listen(3000);